Bearing



Nov. 4, 1941. o. 1-1. DORER BEARING Filed May 23, 1959 3 Sheets-Sheet l uw on sham. @WND [I. l E, n n @v .v MN WN .NN j mh. b. NN NN ,mvwx OW nw uw .vw m W1 .N NN .1.111 1111 MIMI w Q ...1N ...H1111 ,1. 11.11.1111 m1 1n.. ww vn .1 h 1 H wmv QN |111 nlNI K n QW ,WV wn. 1111111111 1- 1111, N WN @N @N NN QN Nw. l IIP l. l I l I l l IIVJWII|L g @www a..

Usar H. Drer INVENTOP.

ATTORNEY Nov. 4, 1941. o. H. DORER 2,261,236

BEARING Filed May 23, 1939 3 Sheets-Sheet 2 A sa Oscar H. Doral lNv ENTOR ATTORNEY O. H. DORER NOA". 4, 1941.

BEARING Filed May 25, 1939 5 Sheets-Sheet 3 [Iscar H. Durer' INVENTOR j//` BY f ATTORNEY Patented Nov. 4, 1941 UNITED 'STAT 'i OFFICE.

BEARING applicati@ May 23, 1939, serial No. 275,160

(ci. sos-7s) 1 Claim.

This invention relates to pumps and more particularly to centrifugal pumps employed for pumping hotl water or other hot liquids.

In close coupled steam driven centrifugal pumps, particularly pumps on portable equipment, lubrication is a problem because of excessive heating of the lubricating oil by the heat transmission toward the middle parts of the pump, both from the steam driver and the hot liquid being pumped, and an object of the pres# ent invention is to provide means in a centrifugal pump of the type specified for cooling the lubricating oil employed in lubricating the bearings of the pump.

Another object of the present invention is to provide in a multi-stage centrifugal pump a diffusion ring formed in one piece which is provided with a plurality of radial tortuous passages for leading the discharge of the first stage irnpeller to the suction of the second or successive stage impeller, and also having a plurality of substantially radial discharge passages therein for the second or final stage impeller of the pump. The various passages in the diffuser ring and the surfaces thereof which are engaged by fluid under discharge pressure of the stages are constructed and arranged whereby the one piece diiuser will be held firmly against a gasketed shoulder on the pump casing to prevent interstage leakage in the pump.

Another object of the present invention is to provide an elastic connection, in the form of elastic packing rings, between the one piece diffuser and the end of the pump casing.

With these and other objects in view, as may appear from the accompanying specification, the invention consists in various features of construction and combination of parts, which will be rst described in connection with the accompanying drawings showing the improved centrifugal pump, and features forming the invention will be specifically pointed out in the claim.

In the drawings:

Figure 1 is a longitudinal section through the improved pump.

Figure 2 is an end view of the one piece diffuser.

Figure 3 is a vertical section through the one piece diffuser taken on the line 3-3 of Figure 2.

Figure 4 is a fragmentary diagrammatic View of the one piece diffuser showing the interstage passages.

Figure 5 is a detail section taken on line 5-5 of Figure 4.

Figure 6 is a detail section taken on line 6-6 of Figure 4.

Referring more particularly to the drawings, the centrifugal pump structure comprises a casing I including the water or liquid chambers and passages, in which is positioned the various impellers. In the drawings a two-stage pump is shown employing one double suction impeller and one single suction impeller, but it is to be understood that the invention is equally applicable to other types of centrifugal pumps, regardless of the impeller structures, the number of impellers employed, or the number of stages of the pump.

'Ihe impellers are mounted upon and rotate with the impeller shaft 5 which projects out of the uid chamber embodying portion of the casing I into and through the casing extension 6, as clearly shown in the drawings. The casing eX- tension 6 serves as means of connecting the prime mover or steam actuated driver 1 to the pump structure proper so as to provide a compact, close-coupled unitary pumping unit. The shaft 5 is supported intermediate the pump structure proper Aland the prime mover 'I by spaced bearings 8 and 9, each of which is positioned at the opposite open ends of the oil dis-l tributor chamber Ill. The oil distributor chamber I0 is mounted about the shaft 5 and is stationary, being connected to and supported from the inner casing II. The inner casing I I forms an oil reservoir I2 and is in turn connected to and supported by the casing extension 6. The oil reservoir I2 formed by the inner casing II is cylindrical in shape, and the initial supply of lubricating oil thereto is through the supply passage I4.

The inner casing II is spaced from the inner surface of the casing extension 6, forming an annular space I5 within the casing extension 6 and about the inner casing I I. The inner casing II has heat radiating fins I6 on its outer surface which project into the space I5. A screened air inlet II opens through the casing extension 6 into the space I5 and a plurality of passages I8, which are spaced radially about the axis of the shaft 5, extend from the space I5 into a chamber I9 which is formed in the casing extension 6. A suction fan 2D, of any approved type, is

mounted on the shaft 5 for rotation therewith,

provided with an outlet 2|, which opens to atmosphere. The circulation of air through the space I5 will cool the inner casing II and fins I5, dissipating the heat transmitted to this inner casing from the lubricating oil in the reservoir l2 and consequently cooling the oil.

The distributor chamber I has communication with the oil reservoir I2 through suitable openings 22, so that a quantity of the lubricating oil may pass from the reservoir I2 into the chamber Il). A slinger 23 is mounted on the shaft 5 and is positioned centrally within the chamber I0. This slinger 23 picks up the oil from the bottom of the chamber I0, during rotation of the shaft 5, and creates an oil mist in the chamber which passes to the bearings 8 and 9 and thoroughly lubricates them. The oil from the bearings 8 and 9 returns to the reservoir I2 where it is cooled and subsequently picked up by the slinger 23 for recirculation. A suitable drain 25 is provided to permit draining of the lubricating oil from the reservoir I2.

Another feature of the present improved pump is the construction and arrangement of the diffuser which provides the inter-stage and discharge passages of the pump.

The pump casing proper, indicated at 30, being a part of the complete casing I, has an inlet 3I for the uid to be pumped and a discharge or outlet 32 for the fluid after it has passed through the impellers of the pump.

The inlet 3| opens into the inlet chamber 33 formed withinl the casing 30. The chamber 33 opens directly into the suction eye 34 of the double-suction, first stage impeller 35, and opens into the other suction eye 36 of the first stage impeller through the substantially radial, annular passage 31, which is formed in the diffuser 38. The discharge from the first Stage impeller 35 is into the annular volute 39. The diffuser 38 has a plurality of inter-stage passages 40, shown in dotted lines in Figure 4 of the drawings. These passages 49 twist radially and laterally and progressively increase in cross sectional area from their inlet ends, which communicate with the 1 volute 39, to their lateral opening 4I into the inlet chamber 42, formed within the end of the diffusion member 38 remote from the end in which the initial stage impeller 35 is mounted. From the chamber 42 the fluid being pumped enters the suction eye 43 of the second stage impeller 44.

As shown in the fragmentary diagrammatic Figure 4, a plurality of the inter-stage passages 4D are provided, and the progression of these passages is shown in Figure 1 of the drawings, and the fragmentary sections and 6.

The passages 4D open into the annular volute 39, as shown in dotted lines at 46 in Figures 4 and 6 of the drawings, and from the point of communication of the passages, these passages gradually increase in cross-sectional area, as clearly shown in Figures 4, 5 and 6, and twist from the substantially circumferential or concentric axial line of their entrance communication to the volute into their lateral dischargei l 4| into the suction chamber 42'. The upper half of Figure 1 of the drawings shows the passage on the section shown by the line .3A- 3A of Figure 4 of the drawings, while the lower half of the View shows the section through the passages and the diffuser on the line 3B-3B of Figure 4. This deviation in the shape of the passages and the diffuser in the upper and lower parts of Figure 1 is occasioned by the fact that the section is taken through the diffuser on a continuation of the line 3A--3A, namely on the line 3-3 of Figure 2, and consequently the sectional line bisects different interstage passages at different points along their length.

From the second or nal stage impeller 44 the liquid is pumped into the annular volute 41 and passes from the annular volute through a plurality of radial discharge passages 48 into the annular discharge chamber 49 formed in the casing 30 and from thence through the outlet 32.

The casing 39 has an annular ring 5D formed thereon and extending inwardly into the casing forming a shoulder 5I facing towards the discharge end of the pump. An annular ring 52 is formed upon the diffusion member 38 intermediate its ends and faces the shoulder 5I. A gasket 53 is placed between the facing surfaces of the shoulder 5l and ring 52 so as to provide a fluid tight seal therebetween and prevent interstage leakage in the pump. The ring 52 is pressed or forced against the shoulder 5I by the discharge pressures of the various stages of the pump. It will be noted by particular reference to Figures 1, 4, 5 and 6 of the drawings that the interstage passages 48 have their greater areas which are subject to pressure of the fluid discharged. from the rst stage impeller facing towards the suction or inlet end of the pump, and also the relatively large area 54 of the removable plate 55, which is subject to discharge pressure of the first stage impeller, is positioned so that the discharge pressure of fluid pumped by the first stage impeller will act to force the ring 52 against the shoulder 5I. In the final discharge chamber 49 of the pump the nal discharge pressure of the fluid will also act against the surface 56 of the ring 52 to force it against the shoulder 5I. Thus all of the discharge pressures in the pump act on the diffusion member 38 to force the ring 52 against the gasket 53 and shoulder 5I to provide a fluid-tight inter-stage seal to prevent interstage leakage in the pump.

The removable plate 55 is made removable for the purpose of assembly of the second stage impeller 44 within the diffuser.

The pump casing 39 has its outer end open to facilitate the impeller and diffuser member assembly within the pump and this outer open end is closed by a closure head or plate 51, which is bolted or otherwise securely attached to the casing 39.

The diffuser member 38 has an annular ring 58 formed thereon, providing a shoulder 59 which faces towards the removable head 51 and provides an annular space between the facing circumferences of the diffuser member at its outer end and the casing 38. Elastic packing 60 of any approved type is mounted in this annular space and it engages against the shoulder 59. An annular ring 6I is formed on the head 51 and extends into the annular packing receiving space, engaging the packing 50 for forcing it against the shoulder 59 and holding the packing securely in place to provide an elastic fluid-tight joint between the diffuser 38 and the casing 3D of the pump. As clearly shown at 62, the end of the diffuser member 38 is spaced from the inner face of the removable head 51.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention defined by the claim.

What is claimed is:

In a bearing, a shaft, a housing enclosing a the lower portion thereof to permit oil to pass from the reservoir into the distributor chamber, a casing extension lsurrounding said inner casing and` spaced therefrom to form an air chamber about the oil reservoir, a suction fan carried by said shaft, said casing extension having an air inlet opening and having portions thereof cooperating With said oil reservoir forming casing to form a passage opening from the air space to said fan whereby the fan Will draw air through the air space.

OSCAR H. DORER. 

